feat: bind vim-style line-by-line scrolling (#8980)

Co-authored-by: Aiden Cline <aidenpcline@gmail.com>

packages/opencode/src/cli/cmd/tui/event.ts

@@ -16,6 +16,8 @@ export const TuiEvent = {
           "session.compact",
           "session.page.up",
           "session.page.down",
+          "session.line.up",
+          "session.line.down",
           "session.half.page.up",
           "session.half.page.down",
           "session.first",

packages/opencode/src/cli/cmd/tui/routes/session/index.tsx

@@ -601,6 +601,28 @@ export function Session() {
         dialog.clear()
       },
     },
+    {
+      title: "Line up",
+      value: "session.line.up",
+      keybind: "messages_line_up",
+      category: "Session",
+      disabled: true,
+      onSelect: (dialog) => {
+        scroll.scrollBy(-1)
+        dialog.clear()
+      },
+    },
+    {
+      title: "Line down",
+      value: "session.line.down",
+      keybind: "messages_line_down",
+      category: "Session",
+      disabled: true,
+      onSelect: (dialog) => {
+        scroll.scrollBy(1)
+        dialog.clear()
+      },
+    },
     {
       title: "Half page up",
       value: "session.half.page.up",

packages/opencode/src/config/config.ts

@@ -651,8 +651,14 @@ export namespace Config {
       session_unshare: z.string().optional().default("none").describe("Unshare current session"),
       session_interrupt: z.string().optional().default("escape").describe("Interrupt current session"),
       session_compact: z.string().optional().default("<leader>c").describe("Compact the session"),
-      messages_page_up: z.string().optional().default("pageup").describe("Scroll messages up by one page"),
-      messages_page_down: z.string().optional().default("pagedown").describe("Scroll messages down by one page"),
+      messages_page_up: z.string().optional().default("pageup,ctrl+alt+b").describe("Scroll messages up by one page"),
+      messages_page_down: z
+        .string()
+        .optional()
+        .default("pagedown,ctrl+alt+f")
+        .describe("Scroll messages down by one page"),
+      messages_line_up: z.string().optional().default("ctrl+alt+y").describe("Scroll messages up by one line"),
+      messages_line_down: z.string().optional().default("ctrl+alt+e").describe("Scroll messages down by one line"),
       messages_half_page_up: z.string().optional().default("ctrl+alt+u").describe("Scroll messages up by half page"),
       messages_half_page_down: z
         .string()

packages/opencode/src/server/routes/tui.ts

@@ -275,6 +275,8 @@ export const TuiRoutes = lazy(() =>
             session_compact: "session.compact",
             messages_page_up: "session.page.up",
             messages_page_down: "session.page.down",
+            messages_line_up: "session.line.up",
+            messages_line_down: "session.line.down",
             messages_half_page_up: "session.half.page.up",
             messages_half_page_down: "session.half.page.down",
             messages_first: "session.first",